taskd/mail.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2007 Andy Parkins
   4 #
   5 # An example hook script to mail out commit update information.  This hook
   6 # sends emails listing new revisions to the repository introduced by the
   7 # change being reported.  The rule is that (for branch updates) each commit
   8 # will appear on one email and one email only.
   9 #
  10 # =================
  11 # This is Girocco-customized version. No matter what is said below, it has
  12 # following changes:
  13 # * Calling with arguments is same as giving them on stdin.
  14 # * Optional fourth parameter is project name, used at most places instead
  15 #   of description.
  16 # * Optional fifth parameter is email sender.
  17 # * Load shlib.
  18 # * Default subject prefix is site name.
  19 # * Unsubscribe instructions in email footer.
  20 # * Default showrev includes gitweb link.
  21 # =================
  22 #
  23 # This hook is stored in the contrib/hooks directory.  Your distribution
  24 # will have put this somewhere standard.  You should make this script
  25 # executable then link to it in the repository you would like to use it in.
  26 # For example, on debian the hook is stored in
  27 # /usr/share/doc/git-core/contrib/hooks/post-receive-email:
  28 #
  29 #  chmod a+x post-receive-email
  30 #  cd /path/to/your/repository.git
  31 #  ln -sf /usr/share/doc/git-core/contrib/hooks/post-receive-email hooks/post-receive
  32 #
  33 # This hook script assumes it is enabled on the central repository of a
  34 # project, with all users pushing only to it and not between each other.  It
  35 # will still work if you don't operate in that style, but it would become
  36 # possible for the email to be from someone other than the person doing the
  37 # push.
  38 #
  39 # Config
  40 # ------
  41 # hooks.mailinglist
  42 #   This is the list that all pushes will go to; leave it blank to not send
  43 #   emails for every ref update.
  44 # hooks.announcelist
  45 #   This is the list that all pushes of annotated tags will go to.  Leave it
  46 #   blank to default to the mailinglist field.  The announce emails lists
  47 #   the short log summary of the changes since the last annotated tag.
  48 # hooks.envelopesender
  49 #   If set then the -f option is passed to sendmail to allow the envelope
  50 #   sender address to be set
  51 # hooks.emailprefix
  52 #   All emails have their subjects prefixed with this prefix, or "[SCM]"
  53 #   if emailprefix is unset, to aid filtering
  54 # hooks.showrev
  55 #   The shell command used to format each revision in the email, with
  56 #   "%s" replaced with the commit id.  Defaults to "git rev-list -1
  57 #   --pretty %s", displaying the commit id, author, date and log
  58 #   message.  To list full patches separated by a blank line, you
  59 #   could set this to "git show -C %s; echo".
  60 #   To list a gitweb/cgit URL *and* a full patch for each change set, use this:
  61 #     "t=%s; printf 'http://.../?id=%%s' \$t; echo;echo; git show -C \$t; echo"
  62 #   Be careful if "..." contains things that will be expanded by shell "eval"
  63 #   or printf.
  64 #
  65 # Notes
  66 # -----
  67 # All emails include the headers "X-Git-Refname", "X-Git-Oldrev",
  68 # "X-Git-Newrev", and "X-Git-Reftype" to enable fine tuned filtering and
  69 # give information for debugging.
  70 #
  71
  72 # ---------------------------- Functions
  73
  74 #
  75 # Top level email generation function.  This decides what type of update
  76 # this is and calls the appropriate body-generation routine after outputting
  77 # the common header
  78 #
  79 # Note this function doesn't actually generate any email output, that is
  80 # taken care of by the functions it calls:
  81 #  - generate_email_header
  82 #  - generate_create_XXXX_email
  83 #  - generate_update_XXXX_email
  84 #  - generate_delete_XXXX_email
  85 #  - generate_email_footer
  86 #
  87 generate_email()
  88 {
  89         # --- Arguments
  90         oldrev=$(git rev-parse $1)
  91         newrev=$(git rev-parse $2)
  92         refname="$3"
  93
  94         # --- Interpret
  95         # 0000->1234 (create)
  96         # 1234->2345 (update)
  97         # 2345->0000 (delete)
  98         if expr "$oldrev" : '0*$' >/dev/null
  99         then
 100                 change_type="create"
 101         else
 102                 if expr "$newrev" : '0*$' >/dev/null
 103                 then
 104                         change_type="delete"
 105                 else
 106                         change_type="update"
 107                 fi
 108         fi
 109
 110         # --- Get the revision types
 111         newrev_type=$(git cat-file -t $newrev 2> /dev/null)
 112         oldrev_type=$(git cat-file -t "$oldrev" 2> /dev/null)
 113         case "$change_type" in
 114         create|update)
 115                 rev="$newrev"
 116                 rev_type="$newrev_type"
 117                 ;;
 118         delete)
 119                 rev="$oldrev"
 120                 rev_type="$oldrev_type"
 121                 ;;
 122         esac
 123
 124         # The revision type tells us what type the commit is, combined with
 125         # the location of the ref we can decide between
 126         #  - working branch
 127         #  - tracking branch
 128         #  - unannoted tag
 129         #  - annotated tag
 130         case "$refname","$rev_type" in
 131                 refs/tags/*,commit)
 132                         # un-annotated tag
 133                         refname_type="tag"
 134                         short_refname=${refname##refs/tags/}
 135                         ;;
 136                 refs/tags/*,tag)
 137                         # annotated tag
 138                         refname_type="annotated tag"
 139                         short_refname=${refname##refs/tags/}
 140                         # change recipients
 141                         if [ -n "$announcerecipients" ]; then
 142                                 recipients="$announcerecipients"
 143                         fi
 144                         ;;
 145                 refs/heads/*,commit)
 146                         # branch
 147                         refname_type="branch"
 148                         short_refname=${refname##refs/heads/}
 149                         ;;
 150                 refs/remotes/*,commit)
 151                         # tracking branch
 152                         refname_type="tracking branch"
 153                         short_refname=${refname##refs/remotes/}
 154                         echo >&2 "*** Push-update of tracking branch, $refname"
 155                         echo >&2 "***  - no email generated."
 156                         exit 0
 157                         ;;
 158                 *)
 159                         # Anything else (is there anything else?)
 160                         echo >&2 "*** Unknown type of update to $refname ($rev_type)"
 161                         echo >&2 "***  - no email generated"
 162                         exit 1
 163                         ;;
 164         esac
 165
 166         # Check if we've got anyone to send to
 167         if [ -z "$recipients" ]; then
 168                 case "$refname_type" in
 169                         "annotated tag")
 170                                 config_name="hooks.announcelist"
 171                                 ;;
 172                         *)
 173                                 config_name="hooks.mailinglist"
 174                                 ;;
 175                 esac
 176                 echo >&2 "*** $config_name is not set so no email will be sent"
 177                 echo >&2 "*** for $refname update $oldrev->$newrev"
 178                 exit 0
 179         fi
 180
 181         # Email parameters
 182         # The email subject will contain the best description of the ref
 183         # that we can build from the parameters
 184         describe=$(git describe $rev 2>/dev/null)
 185         if [ -z "$describe" ]; then
 186                 describe=$rev
 187         fi
 188
 189         generate_email_header
 190
 191         # Call the correct body generation function
 192         fn_name=general
 193         case "$refname_type" in
 194         "tracking branch"|branch)
 195                 fn_name=branch
 196                 ;;
 197         "annotated tag")
 198                 fn_name=atag
 199                 ;;
 200         esac
 201         generate_${change_type}_${fn_name}_email
 202
 203         generate_email_footer
 204 }
 205
 206 generate_email_header()
 207 {
 208         # --- Email (all stdout will be the email)
 209         # Generate header
 210         if [ -n "$emailsender" ]; then
 211                 echo "From: $emailsender"
 212         fi
 213         cat <<-EOF
 214         To: $recipients
 215         Subject: ${emailprefix}$projectname $refname_type, $short_refname, ${change_type}d. $describe
 216         X-Git-Refname: $refname
 217         X-Git-Reftype: $refname_type
 218         X-Git-Oldrev: $oldrev
 219         X-Git-Newrev: $newrev
 220
 221         This is an automated email from the git hooks/post-receive script. It was
 222         generated because a ref change was pushed to the repository containing
 223         the project $projectname.
 224
 225         The $refname_type, $short_refname has been ${change_type}d
 226         EOF
 227 }
 228
 229 generate_email_footer()
 230 {
 231         SPACE=" "
 232         cat <<-EOF
 233
 234
 235         $cfg_name automatic notification. Contact project admin $projectowner if you want
 236         to unsubscribe, or site admin $cfg_admin if you receive no reply.
 237         --${SPACE}
 238         $projectboth
 239         EOF
 240 }
 241
 242 # --------------- Branches
 243
 244 #
 245 # Called for the creation of a branch
 246 #
 247 generate_create_branch_email()
 248 {
 249         # This is a new branch and so oldrev is not valid
 250         echo "        at  $newrev ($newrev_type)"
 251         echo ""
 252
 253         echo $LOGBEGIN
 254         show_new_revisions
 255         echo $LOGEND
 256 }
 257
 258 #
 259 # Called for the change of a pre-existing branch
 260 #
 261 generate_update_branch_email()
 262 {
 263         # Consider this:
 264         #   1 --- 2 --- O --- X --- 3 --- 4 --- N
 265         #
 266         # O is $oldrev for $refname
 267         # N is $newrev for $refname
 268         # X is a revision pointed to by some other ref, for which we may
 269         #   assume that an email has already been generated.
 270         # In this case we want to issue an email containing only revisions
 271         # 3, 4, and N.  Given (almost) by
 272         #
 273         #  git rev-list N ^O --not --all
 274         #
 275         # The reason for the "almost", is that the "--not --all" will take
 276         # precedence over the "N", and effectively will translate to
 277         #
 278         #  git rev-list N ^O ^X ^N
 279         #
 280         # So, we need to build up the list more carefully.  git rev-parse
 281         # will generate a list of revs that may be fed into git rev-list.
 282         # We can get it to make the "--not --all" part and then filter out
 283         # the "^N" with:
 284         #
 285         #  git rev-parse --not --all | grep -v N
 286         #
 287         # Then, using the --stdin switch to git rev-list we have effectively
 288         # manufactured
 289         #
 290         #  git rev-list N ^O ^X
 291         #
 292         # This leaves a problem when someone else updates the repository
 293         # while this script is running.  Their new value of the ref we're
 294         # working on would be included in the "--not --all" output; and as
 295         # our $newrev would be an ancestor of that commit, it would exclude
 296         # all of our commits.  What we really want is to exclude the current
 297         # value of $refname from the --not list, rather than N itself.  So:
 298         #
 299         #  git rev-parse --not --all | grep -v $(git rev-parse $refname)
 300         #
 301         # Get's us to something pretty safe (apart from the small time
 302         # between refname being read, and git rev-parse running - for that,
 303         # I give up)
 304         #
 305         #
 306         # Next problem, consider this:
 307         #   * --- B --- * --- O ($oldrev)
 308         #          \
 309         #           * --- X --- * --- N ($newrev)
 310         #
 311         # That is to say, there is no guarantee that oldrev is a strict
 312         # subset of newrev (it would have required a --force, but that's
 313         # allowed).  So, we can't simply say rev-list $oldrev..$newrev.
 314         # Instead we find the common base of the two revs and list from
 315         # there.
 316         #
 317         # As above, we need to take into account the presence of X; if
 318         # another branch is already in the repository and points at some of
 319         # the revisions that we are about to output - we don't want them.
 320         # The solution is as before: git rev-parse output filtered.
 321         #
 322         # Finally, tags: 1 --- 2 --- O --- T --- 3 --- 4 --- N
 323         #
 324         # Tags pushed into the repository generate nice shortlog emails that
 325         # summarise the commits between them and the previous tag.  However,
 326         # those emails don't include the full commit messages that we output
 327         # for a branch update.  Therefore we still want to output revisions
 328         # that have been output on a tag email.
 329         #
 330         # Luckily, git rev-parse includes just the tool.  Instead of using
 331         # "--all" we use "--branches"; this has the added benefit that
 332         # "remotes/" will be ignored as well.
 333
 334         # List all of the revisions that were removed by this update, in a
 335         # fast forward update, this list will be empty, because rev-list O
 336         # ^N is empty.  For a non fast forward, O ^N is the list of removed
 337         # revisions
 338         fast_forward=""
 339         rev=""
 340         for rev in $(git rev-list $newrev..$oldrev)
 341         do
 342                 revtype=$(git cat-file -t "$rev")
 343                 echo "  discards  $rev ($revtype)"
 344         done
 345         if [ -z "$rev" ]; then
 346                 fast_forward=1
 347         fi
 348
 349         # List all the revisions from baserev to newrev in a kind of
 350         # "table-of-contents"; note this list can include revisions that
 351         # have already had notification emails and is present to show the
 352         # full detail of the change from rolling back the old revision to
 353         # the base revision and then forward to the new revision
 354         for rev in $(git rev-list $oldrev..$newrev)
 355         do
 356                 revtype=$(git cat-file -t "$rev")
 357                 echo "       via  $rev ($revtype)"
 358         done
 359
 360         if [ "$fast_forward" ]; then
 361                 echo "      from  $oldrev ($oldrev_type)"
 362         else
 363                 #  1. Existing revisions were removed.  In this case newrev
 364                 #     is a subset of oldrev - this is the reverse of a
 365                 #     fast-forward, a rewind
 366                 #  2. New revisions were added on top of an old revision,
 367                 #     this is a rewind and addition.
 368
 369                 # (1) certainly happened, (2) possibly.  When (2) hasn't
 370                 # happened, we set a flag to indicate that no log printout
 371                 # is required.
 372
 373                 echo ""
 374
 375                 # Find the common ancestor of the old and new revisions and
 376                 # compare it with newrev
 377                 baserev=$(git merge-base $oldrev $newrev)
 378                 rewind_only=""
 379                 if [ "$baserev" = "$newrev" ]; then
 380                         echo "This update discarded existing revisions and left the branch pointing at"
 381                         echo "a previous point in the repository history."
 382                         echo ""
 383                         echo " * -- * -- N ($newrev)"
 384                         echo "            \\"
 385                         echo "             O -- O -- O ($oldrev)"
 386                         echo ""
 387                         echo "The removed revisions are not necessarilly gone - if another reference"
 388                         echo "still refers to them they will stay in the repository."
 389                         rewind_only=1
 390                 else
 391                         echo "This update added new revisions after undoing existing revisions.  That is"
 392                         echo "to say, the old revision is not a strict subset of the new revision.  This"
 393                         echo "situation occurs when you --force push a change and generate a repository"
 394                         echo "containing something like this:"
 395                         echo ""
 396                         echo " * -- * -- B -- O -- O -- O ($oldrev)"
 397                         echo "            \\"
 398                         echo "             N -- N -- N ($newrev)"
 399                         echo ""
 400                         echo "When this happens we assume that you've already had alert emails for all"
 401                         echo "of the O revisions, and so we here report only the revisions in the N"
 402                         echo "branch from the common base, B."
 403                 fi
 404         fi
 405
 406         echo ""
 407         if [ -z "$rewind_only" ]; then
 408                 echo "Those revisions listed above that are new to this repository have"
 409                 echo "not appeared on any other notification email; so we list those"
 410                 echo "revisions in full, below."
 411
 412                 echo ""
 413                 echo $LOGBEGIN
 414                 show_new_revisions
 415
 416                 # XXX: Need a way of detecting whether git rev-list actually
 417                 # outputted anything, so that we can issue a "no new
 418                 # revisions added by this update" message
 419
 420                 echo $LOGEND
 421         else
 422                 echo "No new revisions were added by this update."
 423         fi
 424
 425         # The diffstat is shown from the old revision to the new revision.
 426         # This is to show the truth of what happened in this change.
 427         # There's no point showing the stat from the base to the new
 428         # revision because the base is effectively a random revision at this
 429         # point - the user will be interested in what this revision changed
 430         # - including the undoing of previous revisions in the case of
 431         # non-fast forward updates.
 432         echo ""
 433         echo "Summary of changes:"
 434         git diff-tree --stat --summary --find-copies-harder $oldrev..$newrev
 435 }
 436
 437 #
 438 # Called for the deletion of a branch
 439 #
 440 generate_delete_branch_email()
 441 {
 442         echo "       was  $oldrev"
 443         echo ""
 444         echo $LOGEND
 445         git show -s --pretty=oneline $oldrev
 446         echo $LOGEND
 447 }
 448
 449 # --------------- Annotated tags
 450
 451 #
 452 # Called for the creation of an annotated tag
 453 #
 454 generate_create_atag_email()
 455 {
 456         echo "        at  $newrev ($newrev_type)"
 457
 458         generate_atag_email
 459 }
 460
 461 #
 462 # Called for the update of an annotated tag (this is probably a rare event
 463 # and may not even be allowed)
 464 #
 465 generate_update_atag_email()
 466 {
 467         echo "        to  $newrev ($newrev_type)"
 468         echo "      from  $oldrev (which is now obsolete)"
 469
 470         generate_atag_email
 471 }
 472
 473 #
 474 # Called when an annotated tag is created or changed
 475 #
 476 generate_atag_email()
 477 {
 478         # Use git for-each-ref to pull out the individual fields from the
 479         # tag
 480         eval $(git for-each-ref --shell --format='
 481         tagobject=%(*objectname)
 482         tagtype=%(*objecttype)
 483         tagger=%(taggername)
 484         tagged=%(taggerdate)' $refname
 485         )
 486
 487         echo "   tagging  $tagobject ($tagtype)"
 488         case "$tagtype" in
 489         commit)
 490
 491                 # If the tagged object is a commit, then we assume this is a
 492                 # release, and so we calculate which tag this tag is
 493                 # replacing
 494                 prevtag=$(git describe --abbrev=0 $newrev^ 2>/dev/null)
 495
 496                 if [ -n "$prevtag" ]; then
 497                         echo "  replaces  $prevtag"
 498                 fi
 499                 ;;
 500         *)
 501                 echo "    length  $(git cat-file -s $tagobject) bytes"
 502                 ;;
 503         esac
 504         echo " tagged by  $tagger"
 505         echo "        on  $tagged"
 506
 507         echo ""
 508         echo $LOGBEGIN
 509
 510         # Show the content of the tag message; this might contain a change
 511         # log or release notes so is worth displaying.
 512         git cat-file tag $newrev | sed -e '1,/^$/d'
 513
 514         echo ""
 515         case "$tagtype" in
 516         commit)
 517                 # Only commit tags make sense to have rev-list operations
 518                 # performed on them
 519                 if [ -n "$prevtag" ]; then
 520                         # Show changes since the previous release
 521                         git rev-list --pretty=short "$prevtag..$newrev" | git shortlog
 522                 else
 523                         # No previous tag, show all the changes since time
 524                         # began
 525                         git rev-list --pretty=short $newrev | git shortlog
 526                 fi
 527                 ;;
 528         *)
 529                 # XXX: Is there anything useful we can do for non-commit
 530                 # objects?
 531                 ;;
 532         esac
 533
 534         echo $LOGEND
 535 }
 536
 537 #
 538 # Called for the deletion of an annotated tag
 539 #
 540 generate_delete_atag_email()
 541 {
 542         echo "       was  $oldrev"
 543         echo ""
 544         echo $LOGEND
 545         git show -s --pretty=oneline $oldrev
 546         echo $LOGEND
 547 }
 548
 549 # --------------- General references
 550
 551 #
 552 # Called when any other type of reference is created (most likely a
 553 # non-annotated tag)
 554 #
 555 generate_create_general_email()
 556 {
 557         echo "        at  $newrev ($newrev_type)"
 558
 559         generate_general_email
 560 }
 561
 562 #
 563 # Called when any other type of reference is updated (most likely a
 564 # non-annotated tag)
 565 #
 566 generate_update_general_email()
 567 {
 568         echo "        to  $newrev ($newrev_type)"
 569         echo "      from  $oldrev"
 570
 571         generate_general_email
 572 }
 573
 574 #
 575 # Called for creation or update of any other type of reference
 576 #
 577 generate_general_email()
 578 {
 579         # Unannotated tags are more about marking a point than releasing a
 580         # version; therefore we don't do the shortlog summary that we do for
 581         # annotated tags above - we simply show that the point has been
 582         # marked, and print the log message for the marked point for
 583         # reference purposes
 584         #
 585         # Note this section also catches any other reference type (although
 586         # there aren't any) and deals with them in the same way.
 587
 588         echo ""
 589         if [ "$newrev_type" = "commit" ]; then
 590                 echo $LOGBEGIN
 591                 git show --no-color --root -s --pretty=medium $newrev
 592                 echo $LOGEND
 593         else
 594                 # What can we do here?  The tag marks an object that is not
 595                 # a commit, so there is no log for us to display.  It's
 596                 # probably not wise to output git cat-file as it could be a
 597                 # binary blob.  We'll just say how big it is
 598                 echo "$newrev is a $newrev_type, and is $(git cat-file -s $newrev) bytes long."
 599         fi
 600 }
 601
 602 #
 603 # Called for the deletion of any other type of reference
 604 #
 605 generate_delete_general_email()
 606 {
 607         echo "       was  $oldrev"
 608         echo ""
 609         echo $LOGEND
 610         git show -s --pretty=oneline $oldrev
 611         echo $LOGEND
 612 }
 613
 614
 615 # --------------- Miscellaneous utilities
 616
 617 #
 618 # Show new revisions as the user would like to see them in the email.
 619 #
 620 show_new_revisions()
 621 {
 622         # This shows all log entries that are not already covered by
 623         # another ref - i.e. commits that are now accessible from this
 624         # ref that were previously not accessible
 625         # (see generate_update_branch_email for the explanation of this
 626         # command)
 627
 628         # Revision range passed to rev-list differs for new vs. updated
 629         # branches.
 630         if [ "$change_type" = create ]
 631         then
 632                 # Show all revisions exclusive to this (new) branch.
 633                 revspec=$newrev
 634         else
 635                 # Branch update; show revisions not part of $oldrev.
 636                 revspec=$oldrev..$newrev
 637         fi
 638
 639         other_branches=$(git for-each-ref --format='%(refname)' refs/heads/ |
 640             grep -F -v $refname)
 641         git rev-parse --not $other_branches |
 642 #       if [ -z "$custom_showrev" ]
 643 #       then
 644 #               git rev-list --pretty --stdin $revspec
 645 #       else
 646                 git rev-list --stdin $revspec |
 647                 while read onerev
 648                 do
 649                         if [ -n "$custom_showrev" ]; then
 650                                 eval $(printf "$custom_showrev" $onerev)
 651                         else
 652                                 echo "$cfg_gitweburl/$projectname/commit/$onerev"
 653                                 echo
 654                                 git rev-list -1 --pretty $onerev
 655                                 echo
 656                         fi
 657                 done
 658 #       fi
 659 }
 660
 661
 662 send_mail()
 663 {
 664         if [ -n "$envelopesender" ]; then
 665                 /usr/sbin/sendmail -t -f "$envelopesender"
 666         else
 667                 /usr/sbin/sendmail -t
 668         fi
 669 }
 670
 671 # ---------------------------- main()
 672
 673 # --- Constants
 674 LOGBEGIN="- Log -----------------------------------------------------------------"
 675 LOGEND="-----------------------------------------------------------------------"
 676
 677 # --- Config
 678 . @basedir@/shlib.sh
 679
 680 # Set GIT_DIR either from the working directory, or from the environment
 681 # variable.
 682 GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
 683 if [ -z "$GIT_DIR" ]; then
 684         echo >&2 "fatal: post-receive: GIT_DIR not set"
 685         exit 1
 686 fi
 687
 688 projectdesc=$(sed -ne '1p' "$GIT_DIR/description")
 689 # Check if the description is unchanged from it's default, and shorten it to
 690 # a more manageable length if it is
 691 if expr "$projectdesc" : "Unnamed repository.*$" >/dev/null
 692 then
 693         projectdesc="UNNAMED PROJECT"
 694 fi
 695
 696 projectname="$4"
 697 if [ -n "$projectname" ]; then
 698         projectname="$projectname.git"
 699         projectboth="$projectname (\"$projectdesc\")"
 700         projectowner="$(config_get owner)"
 701 else
 702         projectname="$projectdesc"
 703         projectboth="$projectdesc"
 704 fi
 705
 706 emailsender="$5"
 707
 708 recipients=$(git config hooks.mailinglist)
 709 announcerecipients=$(git config hooks.announcelist)
 710 envelopesender=$(git config hooks.envelopesender)
 711 emailprefix=$(git config hooks.emailprefix || echo "[$cfg_name] ")
 712 custom_showrev=$(git config hooks.showrev)
 713
 714 # --- Main loop
 715 # Allow dual mode: run from the command line just like the update hook, or
 716 # if no arguments are given then run as a hook script
 717 if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
 718         # Output to the terminal in command line mode - if someone wanted to
 719         # resend an email; they could redirect the output to sendmail
 720         # themselves
 721         generate_email $2 $3 $1 | send_mail
 722 else
 723         while read oldrev newrev refname
 724         do
 725                 generate_email $oldrev $newrev $refname | send_mail
 726         done
 727 fi